The Ly line (Vietnamese: chi Ly; chi can also be translated to as branch) was the sixth dynasty of Hùng kings of the Hồng Bàng period of Văn Lang (now Viet Nam). Starting approximately 1712 B.C., the line refers to the rule of Pháp Hải Lang and his successors, when the seat of government was centered at Phú Thọ.

Pháp Hải Lang was born approximately 1740 B.C., and took the regnal name of Hùng Huy Vương upon becoming Hùng king. The series of all Hùng kings following Pháp Hải Lang took that same regnal name of Hùng Huy Vương to rule over Văn Lang until approximately 1632 B.C.

This dynasty, as well as the next dynasty (Khôn line), sought to protect and consolidate Văn Lang's northern borders.

A new dawn of Vietnamese civilization during the Bronze Age in the Red River delta emerged approximately 1700 B.C. with the appearance of the new elaborate set of burial customs. During early time, a deceased person was usually buried with many pieces of pottery, axes, chisels and utensils such as vases and bowls.

During this period, the process of making silk became known to the Vietnamese. Princess Thiều Hoa promoted the rise of silk textile industry.

This period is also best known as the time the Xích Tỵ made their appearance in northern Văn Lang. The outlines of the traditional account of the "invasion" by the Xích Tỵ is preserved in the Giỗ pagoda in Đông Anh District. The army, under the commanding generals Vũ Dực and Vũ Minh, became the salvation of Văn Lang and would eventually lead the war of liberation that drove the Xích Tỵ back into East Asia. Vũ Dực and Vũ Minh completed the conquest and expulsion of the Xích Tỵ from the northern border, restoring stability.

Some other notable military campaigns were under the leadership of Hùng Sơn, Vũ Hồng and Vũ Thị Lê Hoa.

The last Hùng king of this line gave his throne to Prince Lang Liêu because of Lang Liêu's best cook for his offerings to the king of bánh chưng and bánh dày. Lang Liêu founded the 7th Dynasty.

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